Meet The Radeon HD 7790 & Sapphire HD 7790 Dual-X Turbo

Today we’ll be looking at two cards, AMD’s reference card and Sapphire’s customized HD 7790 Dual-X OC. As is typical for cards in this price segment, the designs are relatively simple and as such only a few partners will be using the reference design as opposed to rolling their own designs. At the same time AMD is pushing their partners’ factory overclocked cards hard – we have the Sapphire and then 3 more on their way – but it’s important to keep in mind that not every last 7790 will be factory overclocked. So AMD’s Spartan reference card is a good example of baseline 7790 performance will be like, including how well it performs with a simple, single-fan open air cooler.

As we alluded to a moment ago, AMD’s reference 7790 is a spartan card. At under 7” long it’s actually shorter than the 7770 and has more in common with the 7750 as far as board length goes. Cooling is provided by a small open air cooler, composed of a circular heatsink with copper heatpipes running up from the base of the card and into the heatsink fins. At the center is a single, small fan responsible for providing the airflow for the card. Meanwhile towards the front of the card we find a small upright heatsink, providing the minimal cooling necessary for the MOSFETs regulating power for the card.

As we’re looking at a 128bit card, memory is provided by 4 6GHz Hynix GDDR5 memory modules, placed on the front of the card underneath the heatsink. A lot of AMD’s partners will be shipping their cards with the memory overclocked to 6.4GHz, which is a fairly common overclock for Hynix’s GDDR5 modules these days.

Elsewhere on the card we can see the sole 6pin PCIe power socket, pointing towards the rear of the card. The 7790 does draw more power than the 7770, and while total power consumption is fairly low, it’s still over 75W and hence requires external power. Meanwhile at the top of the card we can see a single CrossFire connector. AMD believes offering CF here when NVIDIA’s closest product doesn’t (the GTX 650 Ti) is a marketable advantage, but CFing a 1GB card in 2013 strikes us as a poor idea.

Finally, for display connectivity AMD has deviated from the rest of the 7000 series a bit. The 7700 and 7800 series used a single row of display connectors, typically composed of an HDMI port, a DL-DVI-I port, and 2 miniDPs. With 7790 however AMD is dropping the miniDPs in favor of one full-size DisplayPort, and at the same time they’re bringing back the stacked DVI connector. 

Taking up space on the 2nd slot of the card’s bracket is a DL-DVI-D port, giving us the first AMD card with two DVI ports in this price range in some time. Note that while Bonaire can drive up to 6 displays it can only drive 2 TMDS-type displays (DVI/HDMI), so the second DVI port can only be used if the HDMI port is not in use.

Radeon HD 7790 Specification Comparison
  Radeon HD 7790 (Ref) Sapphhire HD 7790 OC
Base Clock 1000MHz 1075MHz
Memory Clock 6GHz 6.4GHz
Frame Buffer 1GB 1GB
Width Double Slot Double Slot
Length N/A N/A
Warranty N/A 2 Year
Price Point $149 $159

Meet The Sapphire HD 7790 Dual-X OC

Moving on, we’re also taking a look at a partner card today, Sapphire’s HD 7790 Dual-X OC. Virtually every partner is releasing a factory overclocked card of some kind with their own take on the design, but Sapphire’s 7790 should be a good representation of what to expect given how similar many of the 7790 designs are.

To that end Sapphire’s Dual-X cooler is your fairly standard twin fan design, utilizing a pair of shallow fans mounted over an aluminum heatsink that runs over the length of the card. A pair of copper heatpipes run from the baseplate over the GPU to the heatsink, with the entire solution serving as an open-air cooler. Note that while Sapphire is using AMD’s reference PC design here, they have lengthened their PCB to match the length of their heatsink, and to allow them to turn the PCIe socket 90 degrees so that it now is against the top of the card rather than the rear.

As given away by the OC name, Sapphire will be shipping their card with a decent factory overclock. Shipping speeds will be 1075MHz for the core and 6.4GHz for the memory, a 7.5% core overclock and 6.5% memory overclock respectively. This will be the most common factory overclock, with several other partners shipping their top-end cards with the same overclock.

Other than the custom cooler and factory overclock, Sapphire’s card is otherwise functionally identical to AMD’s reference card. We’re looking at the same display output configuration of 1x DP, 1x HDMI, and 2x DL-DVI, with the same CrossFire capabilities. Sapphire is putting the MSRP of the card at $159, putting a $10 premium on their cooler and factory overclock.

The New PowerTune: Adding Further States The Test


View All Comments

  • ThomasS31 - Friday, March 22, 2013 - link

    I dont think this is the Sea Island generation yet... Reply
  • Ryan Smith - Friday, March 22, 2013 - link

    This is Sea Islands. Oland and Bonaire are both part of the Sea Island family. Reply
  • CeriseCogburn - Sunday, March 24, 2013 - link

    Bonaire sounds (like Bel Air) all stuffy and prim and proper - too bad amd fanboys aren't classy.

    At least it's not pitcairn, the in the pit card.
  • KnightRAF - Monday, March 25, 2013 - link

    Congratulations Cerise, between this article and the HTC One article you have succeeded in injecting so much pointless crap that it is no longer worth the effort to sift your crap out to read the actual comments on the article. Reply
  • extide - Friday, March 22, 2013 - link

    PLEASE!!! Add folding@home benchmarks to your tests, please please!!

    Thank You!
  • JarredWalton - Friday, March 22, 2013 - link

    Might want to read a little better before posting:
  • extide - Tuesday, March 26, 2013 - link

    Sorry, doh, I feel dumb. I quickly scanned the compute page and didn't see it. Thank you VERY MUCH for including these!! Reply
  • MrSpadge - Friday, March 22, 2013 - link

    It's good to see clock & voltage states become more fine-grained and their choice smarter. Ultimately how I'd like a GPU to work: set targets and limits for power use, temperature and noise.. and then crank it up as far as it goes. Vary chips by different amounts of execution units, not frequencies.

    This includes simple user settings for lowering power consumption (call it the "green mode" of whatever), if people want to, which would automatically choose lower voltages to increase efficiency.

    And of course something similar to nVidias frame rate target: if performance if fine now, save power. And save some thermal headroom in case it's needed soon. Make smart use of the power budget. It's nice to see AMD making some progress!
  • Termie - Friday, March 22, 2013 - link

    Ryan, just FYI, you're using Catalyst 13.2 beta 7 with the other cards, not Catalyst 13.7 betas as indicated in the text on "The Test" page. Reply
  • Ryan Smith - Friday, March 22, 2013 - link

    Whoops. Thanks. Reply

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